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Home >> Toyota >> 2018 >> RAV4 XLE, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> SFI System [2AR-FE] (Diagnostic Codes) (Except Hybrid) (6 Of 7) >> SFI System >> DTC P050A: Cold Start Idle Air Control System Performance [12/2012 - 08/2014] >> Procedure

DTC P050A: Cold Start Idle Air Control System Performance [12/2012 - 08/2014]: Procedure

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    5. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes 

      Result

      Result Proceed to
      DTC P050A is output A
      DTC P050A and other DTCs are output B

      HINT: 

      If any DTCs other than P050A are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART:  DIAGNOSTIC TROUBLE CODE CHART [12/2012 - 11/2013]  ,  DIAGNOSTIC TROUBLE CODE CHART [11/2013 - 08/2014] 

    Result: 

    A 

    See step  2

  2. READ VALUE USING TECHSTREAM (FUEL TRIM) 

    HINT: 

    Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter sub-assembly.

    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas AF Control / Short FT #1 and Long FT #1.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      Short FT #1
      Long FT #1
    5. Read the values displayed on the Techstream at engine idle.
    6. Add together the Short FT #1 and Long FT #1 values to obtain the total fuel trim.

      Standard

      Total of Short FT #1 and Long FT #1 values is between -20% and 20%.

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  3

  3. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (THROTTLE VALVE) 
    1. Check that there are no deposits around the throttle valve and throttle valve condition.

      OK

      No deposits around the throttle valve and throttle valve moves smoothly.

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  4

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) 
    NOTE:

    In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2012 - ]

      Powertrain > Engine and ECT > Clear DTCs 

    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON.
    7. Turn the Techstream on.
    8. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      Coolant Temp
    9. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
    10. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
    11. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      Powertrain > Engine and ECT > Utility 

      Tester Display
      All Readiness
    13. Input the DTC: P050A.
    14. Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL (DTC is not output) A
      ABNORMAL (DTC P050A is output) B

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS:  CHECK FOR INTERMITTENT PROBLEMS [12/2012 - ] 

    Result: 

    B 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) 
    1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

      Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2012 - 11/2013] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2013 - 10/2015]

      HINT: 

      Repair any problems.

    Result: 

    NEXT 

    See step  6

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) 
    NOTE:

    In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2012 - ]

      Powertrain > Engine and ECT > Clear DTCs 

    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON.
    7. Turn the Techstream on.
    8. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      Coolant Temp
    9. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
    10. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
    11. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      Powertrain > Engine and ECT > Utility 

      Tester Display
      All Readiness
    13. Input the DTC: P050A.
    14. Check the DTC judgment result.

      Result

      Result Proceed to
      ABNORMAL (DTC P050A is output) A
      NORMAL (DTC is not output) B

    Result: 

    B 

    END 

    Result: 

    A 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) 

    Refer to PROCEDURE - Step 3

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY 
    1. Replace the mass air flow meter sub-assembly.

      Refer to REMOVAL [12/2012 - ]

      HINT: 

      • If the results of the inspections performed in step 16 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.
      • Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

        Refer to INITIALIZATION [12/2012 - ]

    Result: 

    NEXT 

    See step  9

  9. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 

    HINT: 

    In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2012 - ]

      Powertrain > Engine and ECT > Clear DTCs 

    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON.
    7. Turn the Techstream on.
    8. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      Coolant Temp
    9. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
    10. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
    11. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      Powertrain > Engine and ECT > Utility 

      Tester Display
      All Readiness
    13. Input the DTC: P050A.
    14. Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL (DTC is not output) A
      ABNORMAL (DTC P050A is output) B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM:  REMOVAL [12/2012 - ] 

  10. REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY 
    1. Repair or replace the throttle with motor body assembly.

      Refer to REMOVAL [12/2012 - ]

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the throttle with motor body assembly.

      Refer to INITIALIZATION [12/2012 - ]

    Result: 

    NEXT 

    See step  11

  11. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) 
    NOTE:

    In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data).

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2012 - ]

      Powertrain > Engine and ECT > Clear DTCs 

    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON.
    7. Turn the Techstream on.
    8. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      Coolant Temp
    9. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).
    10. Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data.
    11. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      Powertrain > Engine and ECT > Utility 

      Tester Display
      All Readiness
    13. Input the DTC: P050A.
    14. Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL (DTC is not output) A
      ABNORMAL (DTC P050A is output) B

    Result: 

    A 

    END 

    Result: 

    B 

    See step  5

  12. CHECK PCV SYSTEM 
    1. Check the PCV hose connections.

      Refer to PROCEDURE - Step 2

      OK

      PCV valve and hose are connected correctly and are not damaged.

    Result: 

    NG 

    See step  20

    Result: 

    OK 

    See step  13

  13. CHECK INTAKE SYSTEM 
    1. Check the intake system for vacuum leaks.

      Refer to PROCEDURE - Step 1

      OK

      No leaks from the intake system.

    Result: 

    NG 

    See step  19

    Result: 

    OK 

    See step  14

  14. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil.

      OK

      The air cleaner filter element is not excessively contaminated with dirt or oil.

    Result: 

    NG 

    See step  18

    Result: 

    OK 

    See step  15

  15. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY) 
    1. Operate the VVT system through the Active Test, and check if the VVT system is operating normally.
      1. Perform the Active Test, referring to DTC P0011 Procedure (VVT system for intake camshaft).

        Refer to PROCEDURE - Step 2

      2. Perform the Active Test, referring to DTC P0014 Procedure (VVT system for exhaust camshaft).

        Refer to PROCEDURE - Step 2

    Result: 

    NG 

    See step  17

    Result: 

    OK 

    See step  16

  16. READ VALUE USING TECHSTREAM (MAF) 

    Refer to PROCEDURE - Step 6

    Result: 

    OK 

    See step  4

    Result: 

    NG 

    See step  5

  17. CHECK AND REPAIR VVT SYSTEM 
    1. Check and repair the VVT system.

      HINT: 

    Result: 

    NEXT 

    See step  11

  18. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Replace the air cleaner filter element sub-assembly.

    Result: 

    NEXT 

    See step  11

  19. REPAIR OR REPLACE INTAKE SYSTEM 
    1. Repair or replace the intake system.

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the intake system.

      Refer to INITIALIZATION [12/2012 - ]

    Result: 

    NEXT 

    See step  11

  20. REPAIR OR REPLACE PCV HOSE 
    1. Repair or replace the PCV valve or hose.

    Result: 

    NEXT 

    See step  11

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